DBPapers
DOI: 10.5593/sgem2011/s16.103

EFFECT OF COMMERCIAL CEMENTITIOUS MATERIAL ON PHOSPHORUS SORPTION BY AN ACID COARSE-TEXTURED SOIL

AUTHOR/S: A. KARAM, A. JAOUICH, M. BLACKBURN
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 2, 1063-1070 pp

ABSTRACT

Repeated application of phosphorus (P) fertilizer in soils, in excess of crop removal
rates, may increase the concentration of P in soil solution and consequently the transfer
of soluble P to streams. Excess P in natural aquatic systems can promote eutrophication
of lakes and rivers. The application of calcareous sorbent in the adsorptive removal of P
from soil solution could be a suitable technique. The objective of the experiment is to
evaluate the sorption of P in a marginal coarse-textured soil (pH 5.5) amended with a
concrete residue high in calcium compounds (commercial cement) as a function of
contact time. Triplicate 0.50-g samples of soil, CR and soil treated with 0, 5, 10, 15 and
20% of CR (0, 50, 100, 150 and 200 mg CR/kg soil) are mixed with 50 ml of 100 mg
P/L in 100 ml-polyethylene centrifuge tubes. The sorbent suspensions are allowed to
equilibrate for 0.5, 1, 2, 3, 4, 4.5, 6, 24, 48, 72, 96, 168, 360, 504 and 720 h at room
temperature with occasional shaking. Afterwards, they are centrifuged and filtered.
Phosphate in the solution is determined colorimetrically. The P sorption reaction
increases with CR rate and reaction time. Analysis of variance showed very highly
significant effect (p<0.001) of cement rate on P-sorption values. CR alone exhibits very
high sorption capacity. The kinetic curve of sorption demonstrated good fitting with a
logarithmic equation. The results of this study indicate that the cementitious material
added to acidic soil is a potential sorbent for removing anthropogenic P from aqueous
soil suspensions.

Keywords: Portland cement, Kinetic sorption, Remediation.

PAPER 2011/s16.103: EFFECT OF COMMERCIAL CEMENTITIOUS MATERIAL ON PHOSPHORUS SORPTION BY AN ACID COARSE-TEXTURED SOIL

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